Used in peptide synthesis as a protecting group for amino acids, particularly in solid-phase peptide synthesis (SPPS). It helps in the controlled assembly of peptides by preventing unwanted reactions at specific sites. The FMOC group can be easily removed under mild basic conditions, making it suitable for synthesizing complex peptides. The presence of the cyano group in the alanine side chain can influence the peptide's properties, such as stability and binding affinity, making it useful in the development of bioactive peptides and pharmaceutical compounds. It is also employed in the synthesis of peptide-based drugs and research tools for studying protein interactions and functions.